Star Wars Episode VII plot details leaked?

Website badassdigest.com claims to have uncovered initial plot details for the forthcoming J.J.Abrams directed 7th film in the Star Wars series.

These details have not been confirmed, but if you want to avoid all spoilers, don't read on below the Star Wars logo below.

The movie opens with the standard Star Wars crawl (scrolling text recap of the story so far), followed by a camera pan up to the stars.

But instead of the traditional spaceship zooming into frame we see a severed hand, gripping a light saber, tumbling through space.

The hand falls onto a desert planet (supposedly not Tatooine), where it is discovered by Daisy Ridley and John Boyega (who is playing someone trying to change his path in life after deserting from his Stormtrooper unit). They recognize the light saber as a Jedi relic and decide to return it to its lawful owner.

Their quest takes them off world where they meet up with Han Solo and Chewbacca who are no longer piloting the Millenium Falcon. They recognize the light saber as Luke Skywalker's, and reveal they haven't seen their friend in thirty years, since the events of Return of the Jedi.

Meanwhile, on an ice planet (apparently not Hoth), nefarious forces are building a super weapon, one capable of destroying not planets but entire solar systems.